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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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body { |
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background: #000; |
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} |
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path { |
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fill: #fff; |
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stroke: #000; |
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stroke-width: 1.5px; |
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} |
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</style> |
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<body> |
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<script src="//d3js.org/d3.v3.min.js"></script> |
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<script> |
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var width = 960, |
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height = 500; |
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var start = Date.now(), |
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points = []; |
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var bounds = d3.geom.polygon([ |
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[-width / 2, -height / 2], |
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[-width / 2, +height / 2], |
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[+width / 2, +height / 2], |
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[+width / 2, -height / 2] |
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]); |
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circle(0, 0, 120, 96, -.001); |
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circle(0, 0, 30, 10, .03); |
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circle(0, 0, 60, 3, -.05); |
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circle(0, 0, 15, 4, -.02); |
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circle(0, 0, 0, 1, -.02); |
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circle(240, -120, 80, 4, -.02); |
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circle(240, -120, 0, 1, -.02); |
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circle(280, +120, 40, 8, .02); |
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circle(280, +120, 20, 8, -.02); |
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circle(280, +120, 0, 1, .02); |
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var line = d3.svg.line() |
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.interpolate("basis-closed"); |
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var svg = d3.select("body").append("svg") |
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.attr("width", width) |
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.attr("height", height) |
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.append("g") |
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.attr("transform", "translate(" + (width / 2) + "," + (height / 2) + ")"); |
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var path = svg.selectAll("path") |
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.data(points) |
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.enter().append("path"); |
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d3.timer(function() { |
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var voronoi = d3.geom.voronoi(points).map(function(cell) { return bounds.clip(cell); }); |
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path.attr("d", function(point, i) { return line(resample(voronoi[i])); }); |
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}); |
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function circle(cx, cy, r, n, δθ) { |
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d3.range(1e-6, 2 * Math.PI, 2 * Math.PI / n).map(function(θ, i) { |
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var point = [cx + Math.cos(θ) * r, cy + Math.sin(θ) * r]; |
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d3.timer(function(elapsed) { |
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var angle = θ + δθ * elapsed / 60; |
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point[0] = cx + Math.cos(angle) * r; |
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point[1] = cy + Math.sin(angle) * r; |
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}, 0, start); |
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points.push(point); |
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return point; |
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}); |
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} |
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function resample(points) { |
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var i = -1, |
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n = points.length, |
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p0 = points[n - 1], x0 = p0[0], y0 = p0[1], p1, x1, y1, |
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points2 = []; |
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while (++i < n) { |
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p1 = points[i], x1 = p1[0], y1 = p1[1]; |
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points2.push( |
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[(x0 * 2 + x1) / 3, (y0 * 2 + y1) / 3], |
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[(x0 + x1 * 2) / 3, (y0 + y1 * 2) / 3], |
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p1 |
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); |
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p0 = p1, x0 = x1, y0 = y1; |
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} |
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return points2; |
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} |
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</script> |
